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            "title": "Minimum Genetic Mutation",
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            "content": "<p>A gene string can be represented by an 8-character long string, with choices from <code>&#39;A&#39;</code>, <code>&#39;C&#39;</code>, <code>&#39;G&#39;</code>, and <code>&#39;T&#39;</code>.</p>\n\n<p>Suppose we need to investigate a mutation from a gene string <code>start</code> to a gene string <code>end</code> where one mutation is defined as one single character changed in the gene string.</p>\n\n<ul>\n\t<li>For example, <code>&quot;AACCGGTT&quot; --&gt; &quot;AACCGGTA&quot;</code> is one mutation.</li>\n</ul>\n\n<p>There is also a gene bank <code>bank</code> that records all the valid gene mutations. A gene must be in <code>bank</code> to make it a valid gene string.</p>\n\n<p>Given the two gene strings <code>start</code> and <code>end</code> and the gene bank <code>bank</code>, return <em>the minimum number of mutations needed to mutate from </em><code>start</code><em> to </em><code>end</code>. If there is no such a mutation, return <code>-1</code>.</p>\n\n<p>Note that the starting point is assumed to be valid, so it might not be included in the bank.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> start = &quot;AACCGGTT&quot;, end = &quot;AACCGGTA&quot;, bank = [&quot;AACCGGTA&quot;]\n<strong>Output:</strong> 1\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> start = &quot;AACCGGTT&quot;, end = &quot;AAACGGTA&quot;, bank = [&quot;AACCGGTA&quot;,&quot;AACCGCTA&quot;,&quot;AAACGGTA&quot;]\n<strong>Output:</strong> 2\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> start = &quot;AAAAACCC&quot;, end = &quot;AACCCCCC&quot;, bank = [&quot;AAAACCCC&quot;,&quot;AAACCCCC&quot;,&quot;AACCCCCC&quot;]\n<strong>Output:</strong> 3\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>start.length == 8</code></li>\n\t<li><code>end.length == 8</code></li>\n\t<li><code>0 &lt;= bank.length &lt;= 10</code></li>\n\t<li><code>bank[i].length == 8</code></li>\n\t<li><code>start</code>, <code>end</code>, and <code>bank[i]</code> consist of only the characters <code>[&#39;A&#39;, &#39;C&#39;, &#39;G&#39;, &#39;T&#39;]</code>.</li>\n</ul>\n",
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                    "code": "class Solution {\npublic:\n    int minMutation(string start, string end, vector<string>& bank) {\n        \n    }\n};",
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                    "code": "class Solution {\n    public int minMutation(String start, String end, String[] bank) {\n        \n    }\n}",
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                    "code": "class Solution(object):\n    def minMutation(self, start, end, bank):\n        \"\"\"\n        :type start: str\n        :type end: str\n        :type bank: List[str]\n        :rtype: int\n        \"\"\"\n        ",
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                    "code": "public class Solution {\n    public int MinMutation(string start, string end, string[] bank) {\n        \n    }\n}",
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                    "code": "/**\n * @param {string} start\n * @param {string} end\n * @param {string[]} bank\n * @return {number}\n */\nvar minMutation = function(start, end, bank) {\n    \n};",
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                    "code": "# @param {String} start\n# @param {String} end\n# @param {String[]} bank\n# @return {Integer}\ndef min_mutation(start, end, bank)\n    \nend",
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                    "code": "class Solution {\n    func minMutation(_ start: String, _ end: String, _ bank: [String]) -> Int {\n        \n    }\n}",
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                    "code": "impl Solution {\n    pub fn min_mutation(start: String, end: String, bank: Vec<String>) -> i32 {\n        \n    }\n}",
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